<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>02_JS的变量与常量</title>
</head>
<body>
    <script>
      var a='我TM来了';
      console.log(a,typeof a)
      var b=911
      console.log(b,typeof b)
      var c=true
      console.log(c,typeof c)


      let x=1;
      x=3.14;
      console.log(x,typeof x)

      const y=1;
      console.log(y,typeof y)

    </script>
</body>
</html>